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Dishwasher Error Code H20: Troubleshooting Guide

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Quick answer

Error code H20 on your dishwasher indicates a water supply issue. Check the water valve, filter, and inlet hose for clogs or damage. Ensure the water supply is fully open and the pressure is adequate.

Confirm the symptom

Tools and prep

Step-by-step troubleshooting

  1. Check Water Supply Valve
    Do: Locate the water supply valve under the sink and ensure it is fully open.
    Observe: Valve is open and water flows freely.
    Means: Valve was closed or partially closed.
    Next: If valve is open, proceed to next step.
  2. Inspect Water Inlet Hose
    Do: Check the inlet hose for kinks, cracks, or blockages. Straighten any kinks and replace if damaged.
    Observe: Hose is clear and free of damage.
    Means: Hose was obstructed or damaged.
    Next: If hose is clear, move to next step.
  3. Clean Water Filter
    Do: Locate the water filter (usually at the bottom of the dishwasher) and remove it. Rinse it under running water to remove debris.
    Observe: Filter is clean and free of sediment.
    Means: Filter was clogged with debris.
    Next: Reinstall the filter and run a test cycle.
  4. Test Water Pressure
    Do: Check the water pressure using a pressure gauge at the inlet hose connection.
    Observe: Water pressure is within the manufacturer's recommended range (typically 20–120 psi).
    Means: Low water pressure is affecting the dishwasher.
    Next: If pressure is low, check the home's main water supply.
  5. Inspect Water Inlet Valve
    Do: Use a multimeter to test the water inlet valve for continuity. Replace if no continuity is detected.
    Observe: Valve shows proper continuity or is functioning correctly.
    Means: Inlet valve is faulty.
    Next: Replace the water inlet valve if necessary.
  6. Check for Clogs in the Dishwasher
    Do: Remove the lower rack and inspect the spray arms and drain hose for clogs. Clean any debris found.
    Observe: Spray arms and drain hose are clear.
    Means: Internal clogs were preventing proper water flow.
    Next: Run a test cycle to confirm resolution.

Common causes

CauseLikelihoodDifficultyPart often needed
Closed or partially closed water valve
The water supply is restricted, preventing water from entering the dishwasher.		CommonEasyNone
Clogged water filter
Debris and sediment block the water flow to the dishwasher.		CommonEasyWater filter
Kinked or damaged inlet hose
A kink or crack in the hose restricts or stops water flow.		CommonEasy–MediumWater inlet hose
Low water pressure
Insufficient water pressure in the home affects the dishwasher's ability to fill properly.		SometimesMediumNone
Faulty water inlet valve
The valve fails to open, preventing water from entering the dishwasher.		SometimesMediumWater inlet valve
Internal clogs in spray arms or drain hose
Food particles or debris block water flow through the spray arms or drain hose.		SometimesEasyNone

Parts matching

Common replacement parts for error code H20 include:

Purchase parts specific to your dishwasher model for compatibility.

When to call a professional

FAQ

What does error code H20 mean on my dishwasher?

Error code H20 indicates a problem with the water supply, such as a closed valve, clogged filter, or faulty inlet valve.

Can I fix error code H20 myself?

Yes, in most cases you can resolve H20 by checking the water valve, filter, and inlet hose. If the issue is with the inlet valve, it can usually be replaced without professional help.

Why is my dishwasher showing H20 even after I checked the water supply?

There may be an internal clog in the spray arms or drain hose, or the water inlet valve could be faulty and need replacement.

How do I check the water pressure for my dishwasher?

Attach a pressure gauge to the inlet hose connection and check the reading. The pressure should be between 20–120 psi.